Step 1 Find the highest and lowest scores in the distribution Step 2 Compute

# Step 1 find the highest and lowest scores in the

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Step 1. Find the highest and lowest scores in the distribution. Step 2. Compute the real range. Step 3. Create 10 intervals. Divide the real range found in Step 1 by 10 and round this result to the nearest whole number, whether odd or even. This gives you the width i of the interval to be used for this data set. Step 4. Use the lowest score as the minimum value in the lowest interval. Create an interval beginning with this lowest score as the apparent lower limit of the interval. Then count up until you

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have created an interval that contains a number of scores equal to i , computed in Step 3. The highest number is the apparent upper limit of the interval. Example: (Note that this example doesn’t correspond to the numerical example in this assignment.) Suppose that the lowest score in the whole data set were 9. Suppose that your computation of i in Step 3 led to i = 6. Then you would create a bottom interval containing the following scores: 9 10 11 12 13 14. The lowest interval would be 9-14. The apparent lower limit would be 9; the apparent upper limit would be 14. The interval contains i=6 different scores in all. To create the next interval (interval #2), add your interval width to the upper limit of the previous interval (interval #1). That will be the upper limit of your next limit (interval #2). The next highest score compared to the upper limit of your previous interval (interval #1) will be the lower limit of your next interval (interval #2).
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